fix compile failure: legacy cuserid needs to define feature test

diff --git a/src/misc/cuserid.c b/src/misc/cuserid.c
index 8ad0b9f..4e78798 100644 (file)
--- a/src/misc/cuserid.c
+++ b/src/misc/cuserid.c
@@ -1,3 +1,4 @@
+#define _GNU_SOURCE

 #include <pwd.h>
 #include <stdio.h>
 #include <unistd.h>
 #include <pwd.h>
 #include <stdio.h>
 #include <unistd.h>